It's impressive that any stations are heard through the noise..
We found 3 sources of noise at the local neighbour.
3 zones of downlight spots in their basement.
1 zone with about 8 spots in it is the worse one. There is one spot gone bad, so if we are lucky it is the driver for the bad spot which makes the noise.
So, the neighbour will come back to me - hopefully we can solve this issue.